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Amanita zambiana, commonly known as the Zambian slender Caesar, is a basidiomycete fungus in the genus Amanita. An edible mushroom, it is found in Africa, where it is commonly sold in markets. The cap attains a diameter of 10 to 20 centimetres . It is initially spherical to egg-shaped and uniformly olivaceous brown in color, but later becomes flattened and uniformly white from the center. The sticky cap surface is smooth and shiny, and does not retain any fragments of the partial veil; the cap margin has fine radial grooves. Gills are free from attachment to the stem, white, and up to 1.5 cm (1⁄2 in) broad (measuring from the top to the bottom of the gill). Crowded closely together, they are interspersed with three tiers of lamellulae (short gills that do not extend fully from the cap margin to the stem). The gill edges are finely notched and have a woolly appearance. The stem is 10 to 15 cm (4 to 6 in) long by 1.5 to 2 cm (1⁄2 to 3⁄4 in) thick, cylindrical, stout, and hollow. Its surface is whitish, fibrillose, and ringed. An ample membrane-like ring is finely grooved and attached to the upper part of the stem. At the base of the stem lies a broad sac-like volva, which has dimensions of 5 to 10 cm (2 to 4 in) by 3 to 5 cm (1+1⁄4 to 2 in). Initially black-brown in color, the outer layer of the volva eventually breaks up into large warts. The soft cap flesh is up to 1.5 cm (1⁄2 in) thick in the center, white, and does not change color when cut. Spores are 9–13 by 8–10.5 μm, roughly spherical to broadly egg-shaped, hyaline (translucent), inamyloid, thin-walled, and usually contain a single oil drop.

Source: Wikipedia